Like this:

Starting in 10.7.2, Apple set the iCloud sign-in to pop up on the first login.

In 10.10, Apple added a new Diagnostics & Usage window that pops up at first login after the iCloud sign-in.

In 10.12, Apple added another new pop-up window for Siri.

To stop the Siri pop-up window from appearing for your home folder, run the command shown below:

defaults write com.apple.SetupAssistant DidSeeSiriSetup -bool TRUE

Since you normally will be able to run this command only after you’ve seen the Siri pop-up window, I’ve updated my script for suppressing the iCloud and Diagnostic pop-up windows to now also suppress the Siri pop-up window. For more details, see below the jump.

To help make sure that Self Service wasn’t providing the option of upgrading to macOS Sierra to a Mac which couldn’t run it, I needed to compile lists of which Mac models could and couldn’t run macOS Sierra, based on the system requirements that Apple provided. For more details, see below the jump:

I can’t discuss the details of my testing yet because the macOS Sierra NDA still applies until Sierra is released on September 20, 2016. However, for those Mac admins who have also tested this and wish to block it in their own environments ahead of macOS Sierra’s release, I’ve built a management profile and made it available via the link below:

This profile has been tested and works on OS X 10.11.6 and later. It restricts access to the iCloud Drive settings in the iCloud preference pane by graying out iCloud Drive and making it non-selectable.